程序代写 COMP9315 Final Exam

COMP9315 Final Exam

COMP9315 Final Exam

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The University of Wales

COMP9315 DBMS Implementation
Final Exam

DBMS Implementation

[Instructions] [Notes] [PostgreSQL] [C]

[Q1] [Q2] [Q3] [Q4] [Q5] [Q6] [Q7] [Q8]

Question 7 (4 marks)

Consider the following concurrent schedule on three transactions:

T1: R(X) W(X) R(Y) W(Y)
T2: R(Y) R(X) W(Y) W(X)
T3: R(X) R(Y) W(X) W(Y)

Assume that all transactions commit successfully, and
that no system failures prevent complete update of
all changes to the database.

Is the schedule conflict serializable?

(If you need to draw a graph for this, use a piece of paper or a drawing tool.

There’s no need to submit your drawn graph, but some indication of its structure is required)

Is the schedule view serializable?

Show all working.

Instructions:

Type your answer to this question into the file called q7.txt

Submit via:   give cs9315 exam_q7 q7.txt

or via: Webcms3 > exams > Final Exam > Submit Q7 > Make Submission

End of Question

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